Fix duplicate snipsync IDs shared with hello-world (#502)

The empty and sleep-for-days samples were scaffolded from hello-world
and kept its snippet IDs, so typescript-hello-worker and
typescript-hello-client were each defined in three files. Snipsync
resolves duplicates silently, so a doc referencing typescript-hello-worker
got sleep-for-days rather than hello-world.

Renames the copies so both IDs are unique to hello-world.

Author: lennessyy

empty/src/client.ts

@@ -1,4 +1,4 @@
-// @@@SNIPSTART typescript-hello-client
+// @@@SNIPSTART typescript-empty-client
 import { Connection, Client } from '@temporalio/client';
 import { loadClientConnectConfig } from '@temporalio/envconfig';
 import { nanoid } from 'nanoid';

empty/src/worker.ts

@@ -1,4 +1,4 @@
-// @@@SNIPSTART typescript-hello-worker
+// @@@SNIPSTART typescript-empty-worker
 import { NativeConnection, Worker } from '@temporalio/worker';
 import * as activities from './activities';
 import { TASK_QUEUE_NAME } from './shared';

sleep-for-days/src/client.ts

@@ -1,4 +1,4 @@
-// @@@SNIPSTART typescript-hello-client
+// @@@SNIPSTART typescript-sleep-for-days-client
 import { Connection, Client } from '@temporalio/client';
 import { loadClientConnectConfig } from '@temporalio/envconfig';
 import { sleepForDays } from './workflows';

sleep-for-days/src/worker.ts

@@ -1,4 +1,4 @@
-// @@@SNIPSTART typescript-hello-worker
+// @@@SNIPSTART typescript-sleep-for-days-worker
 import { NativeConnection, Worker } from '@temporalio/worker';
 import * as activities from './activities';